Date: Fri, 4 Aug 2017 22:11:42 -0700
Reply-To: Dick Wong <sailingfc@DSLEXTREME.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dick Wong <sailingfc@DSLEXTREME.COM>
Subject: Re: Time Delay LED Lighting Circuit
In-Reply-To: <7C8393F4-A082-4610-9538-A26F492D0C43@shaw.ca>
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With all the talk about a delay circuit, here is what I have. I didn't have time during the week to take pictures and post until tonight.
I got this module from a vendor over 30 years ago. He was trying to have us put it into our trucks as a standard or option ( I used to work Peterbilt Motors). He gave us samples and I still have one. It's a "plug and play". I have never seen another one this small. It's about 2 1/8" long and a little less than 3/8" in diameter.
If someone wants to duplicate it, all I ask is that you give me a couple in return as payment.
Here is the link to a video and pictures. The delay is about 10 seconds and this is powering the three interior (LED) lights of my tin top. https://tinyurl.com/y9ejfkvj
Unfortunately, after messing with it and taking pictures, it doesn't seem to work anymore. Lights will not go off, it just stays on. I am bummed now.
-Dick-
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Alistair Bell
Sent: Wednesday, August 2, 2017 5:40 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Time Delay LED Lighting Circuit
Neil,
Where is my brain? I just remembered I bought a delay timer really unit from banggood. It's this one
Geekcreit® DC 12V LED Display Digital Delay Timer Control Switch Module PLC https://banggood.app.link/YobsCIrqiF
I haven't tried it, and I forget why I bought it :-)
But i think it might be a solution for you. It's not very big. Up to 999 second delay via a relay. Maybe I'll set it up on the breadboard to give you an idea of how it works. And give me an idea of how it works.
Alistair
> On Aug 2, 2017, at 1:09 PM, Neil N <musomuso@gmail.com> wrote:
>
> Thanks for that David. I've been so involved in other wiring projects,
> haven't read this thread yet.
>
> Thats a sizeable cap! Image showing measurements:
>
> http://tinyurl.com/ybxpvnx5
>
> I did see your comment on semiconductors being used for this type of circuit.
>
>> On 8/2/17, David Beierl <dbeierl@attglobal.net> wrote:
>>
>> Osram DE3423 LED festoon lamp is one watt. If you want ten seconds
>> of fading light at average half brightness that would require
>> something like five watt seconds of storage in your capacitor. Say
>> six or seven because of the threshold voltage of the LED. WS = C x
>> V^2 / 2, so C = WS / (V^2 / 2). So C = 7 ws / (12V^2 / 2) = 7 / 72 = ~0.1 farad or 100,000 uF.
>>
>> Here's one that would serve. It's nominal 40 mm diameter and 80 mm
>> length, and it costs ten bucks US in onesies.
>> https://www.digikey.com/product-detail/en/united-chemi-con/ESMH160VSN
>> 104MA80T/565-2624-ND/757837
>>
>> Yrs,
>> d
>>
>>
>>
>>> On Wed, Aug 2, 2017 at 1:32 PM, Neil N <musomuso@gmail.com> wrote:
>>>
>>> Thats great! So about 5 seconds eh? I'd think that for a festoon the
>>> cap(s) would have to be much bigger. But maybe 3 of those small
>>> LED's would be plenty?
>>>
>>
>
>
> --
> Neil n
>
> Blog: Vanagons, Westfalia, general <http://tubaneil.blogspot.ca>
>
> 1988 Westy Images <https://picasaweb.google.com/musomuso/New1988Westy>
>
> 1981 Westfalia "Jaco" Images, technical
> <http://tubaneil.googlepages.com/>
>
> Vanagon-Bus VAG Gas Engine Swap Group <http://tinyurl.com/khalbay>
